Yes, but she's indicated the warranty is a major consideration so tuning isn't a viable solution. The gassers can be tuned, as well.
The problem I am seeing, but she's not seeing it as a problem, is that the characteristics she's using for the rationale of her TDI purchase aren't accurate given the conditions within which she's driving her vehicle.
Se has stated that hse prefers the TDI for its torque, it's mileage, and it's longevity. The mileage and longevity don't apply based on how she seems to be driving it and the off the line torque has been tuned out to comply with the emissions regulations.
I wasn't making an argument that if you aren't driving 30K miles per year you shouldn't be in a diesel, which is what people were getting zealous about in their responses. That's a completely different conversation than the one I was having, which is if you are only driving around town in short bursts the TDI will *not* enjoy the same longevity as a freeway flyer and it will *not* obtain the mileage advantage over an equivalent gas vehicle.
She hasn't test driven a modern vehicle, whether in post-fix 2015 TDI form, 2018 gas form, or electric form. All of them differ significantly from what she is currently driving and from what they were able to deliver even just a few years ago in terms of driving experience. If she's sitting in an armchair relying on outdated information and experiences, that's at least part of the reason she's "paralyzed and agonizing" over this decision--she doesn't even have all of the relevant information under her belt. On a diesel forum, full of diesel enthusiasts, a lot of clamoring and extolling of the benefits of diesel over the other considerations, but that doesn't mean they are the best fit for everyone's driving style even if they believe it to be true.
This is self-imposed paralysis. If you can't be bothered to go down to a local dealership and rule out a variety of options just so you're clear on what you do and don't want or will or won't accept, then you've already reached your conclusion whether you know it or not. It's a strange response, in my opinion, because the perfect car doesn't have to exist in order to test drive a current model. Go down to the dealership and test drive a stripped out 2015 manual...anything, doesn't even have to be a Passat...just to see if it's even driving the way you expect/desire it to. *Then*, after you've decided that a newer one is even worth looking for, go hunting for that needle.